Arachnologische Gesellschaft

Ground-living spiders in wooded habitats under human influence on an island in Finland

Ground-living spiders in wooded habitats under human influence on an island in Finland

Ground-living spiders in wooded habitats under human influence on an island in Finland

Abstract

Spiders were collected by pitfall traps in the south-western archipelago of Finland. Wooded study habitats on a small-sized (1.2 km2) island were: 1) natural open ash grove, 2) dense mixed grove (old overgrown wooded meadow), 3) wooded aspen pasture and 4) wooded meadow, both restored ten years earlier, 5) natural wooded meadow. Highest species and family numbers were found at the natural sites (1 and 5) and the lowest in the dense grove (site 2). Linyphiidae dominated, both at species and individual level, in the groves. Lycosidae were abundant on the wooded meadows and Gnaphosidae on the wooded pasture. The highest faunal similarities were between the groves (70 % species in common) and between the wooded meadows (64 %). The lowest similarity was found between the dense grove (17 %) and the ash grove (23 %) with the aspen pasture. Ten years after clearing, sites 3 and 4 had diverse spider faunas. The fauna at site 4 resembled that on the corresponding natural site (5), thus showing restoration success. Altogether 84 species of spiders were caught. The proportion of Gnaphosidae (16 species found) is high. Most species found in the study are common in south-western Finland and many occur across the whole country. Pardosa lugubris was most dominant at three sites, P. pullata and Diplostyla concolor both at one site. Two species, Enoplognatha thoracica and Micaria fulgens, are included in the Finnish Red Data Book.

Zitate / Referenzen

  • Clayhills T., V. Rinne & S. Koponen (2000): Arthropods in the Southwestern Archipelago National Park: beetles, bugs and spiders in heritage landscapes and sandy islands. – Metsähallituksen luonnonsuojelujulkaisuja, Ser. A 113: 1-87 (in Finnish)

  • Clayhills T., V. Rinne & S. Koponen (2000): Arthropods in the Southwestern Archipelago National Park: beetles, bugs and spiders in heritage landscapes and sandy islands. – Metsähallituksen luonnonsuojelujulkaisuja, Ser. A 113: 1-87 (in Finnish)

  • Clayhills T., V. Rinne & S. Koponen (2008): On insect and spider fauna of Jungfruskär in Houtskär, 2007. Unpublished report to the Finnish Forest and Park Service, Turku. 80 pp. (in Finnish)

  • Clayhills T., V. Rinne & S. Koponen (2008): On insect and spider fauna of Jungfruskär in Houtskär, 2007. Unpublished report to the Finnish Forest and Park Service, Turku. 80 pp. (in Finnish)

  • Koponen S. (2000): Spiders (Araneae) on sandy islands in the southwestern archipelago of Finland. – Ekológia, Bratislava 19, Supplement 4: 79-85

  • Koponen S. (2000): Spiders (Araneae) on sandy islands in the southwestern archipelago of Finland. – Ekológia, Bratislava 19, Supplement 4: 79-85

  • Koponen S. (2008a): Checklist of spiders in Finland (Araneae). 4th version, University of Turku. – Internet: users.utu.fi/sepkopo/checklist_of_spiders_in_Finland.htm

  • Koponen S. (2008a): Checklist of spiders in Finland (Araneae). 4th version, University of Turku. – Internet: users.utu.fi/sepkopo/checklist_of_spiders_in_Finland.htm

  • Koponen S. (2008b): Spiders from groves in the southwestern archipelago of Finland (Araneae). – Revista Ibérica de Aracnología 15: 97-104

  • Koponen S. (2008b): Spiders from groves in the southwestern archipelago of Finland (Araneae). – Revista Ibérica de Aracnología 15: 97-104

  • Lehtinen P.T., S. Koponen & M. Saaristo (1979): Studies on the spider fauna of the southwestern archipelago of Finland II. The Aland mainland and the island of Eckerö. – Memoranda Societatis pro Fauna et Flora Fennica 55: 33-52

    --

  • Lehtinen P.T., S. Koponen & M. Saaristo (1979): Studies on the spider fauna of the southwestern archipelago of Finland II. The Aland mainland and the island of Eckerö. – Memoranda Societatis pro Fauna et Flora Fennica 55: 33-52

  • Lindgren L. (2000): Island pastures. Metsähallitus and Edita Ltd. Helsinki. 203 pp.

  • Lindgren L. (2000): Island pastures. Metsähallitus and Edita Ltd. Helsinki. 203 pp.

  • Pajunen T., N. Fritzén., S. Koponen & P.T. Lehtinen (2010): Spiders Araneae. In: Rassi P., E. Hyvärinen, A. Juslén & I. Mannerkoski (Eds): The 2010 Red List of Finnish species. Ympäristöministeriö & Suomen ympäristökeskus, Helsinki. pp. 357-360 & 366-369

  • Pajunen T., N. Fritzén., S. Koponen & P.T. Lehtinen (2010): Spiders Araneae. In: Rassi P., E. Hyvärinen, A. Juslén & I. Mannerkoski (Eds): The 2010 Red List of Finnish species. Ympäristöministeriö & Suomen ympäristökeskus, Helsinki. pp. 357-360 & 366-369

  • Ryndock J.A., G.E. Stratton, J.S. Brewer & M.M. Holland (2012): Differences in spider community composition among adjacent sites during initial stages of oak woodland restoration. – Restoration Ecology 20: 24-32

  • Ryndock J.A., G.E. Stratton, J.S. Brewer & M.M. Holland (2012): Differences in spider community composition among adjacent sites during initial stages of oak woodland restoration. – Restoration Ecology 20: 24-32